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h264bits.py
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h264bits.py
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class H264Bits:
table9_4a_intra = [47, 31, 15, 0, 23, 27, 29, 30, 7, 11, 13, 14, 39, 43, 45, 46, 16, 3, 5, 10, 12, 19, 21, 26, 28, 35, 37, 42, 44, 1,
2, 4, 8, 17, 18, 20, 24, 6, 9, 22, 25, 32, 33, 34, 36, 40, 38, 41]
table9_4a_inter = [0,16,1,2,4,8,32,3,5,10,12,15,47,7,11,13,14,6,9,31,35,37,42,44,33,34,36,40,39,43,45,46,17,18,20,24,19,21,26,28,23,27,29,30,22,25,38,41]
T1s_TC_coeff_token = [
# [0,2)
['1', '000101', '01', '00000111', '000100', '001', '000000111', '00000110', '0000101', '00011', '0000000111',
'000000110', '00000101', '000011', '00000000111', '0000000110', '000000101', '0000100', '0000000001111',
'00000000110', '0000000101', '00000100', '0000000001011', '0000000001110', '00000000101', '000000100',
'0000000001000', '0000000001010', '0000000001101', '0000000100', '00000000001111', '00000000001110',
'0000000001001', '00000000100', '00000000001011', '00000000001010', '00000000001101', '0000000001100',
'000000000001111', '000000000001110', '00000000001001', '00000000001100', '000000000001011', '000000000001010',
'000000000001101', '00000000001000', '0000000000001111', '000000000000001', '000000000001001',
'000000000001100', '0000000000001011', '0000000000001110', '0000000000001101', '000000000001000',
'0000000000000111', '0000000000001010', '0000000000001001', '0000000000001100', '0000000000000100',
'0000000000000110', '0000000000000101', '0000000000001000'],
# [2,4)
['11', '001011', '10', '000111', '00111', '011', '0000111', '001010', '001001', '0101', '00000111', '000110',
'000101', '0100', '00000100', '0000110', '0000101', '00110', '000000111', '00000110', '00000101', '001000',
'00000001111', '000000110', '000000101', '000100', '00000001011', '00000001110', '00000001101', '0000100',
'000000001111', '00000001010', '00000001001', '000000100', '000000001011', '000000001110', '000000001101',
'00000001100', '000000001000', '000000001010', '000000001001', '00000001000', '0000000001111', '0000000001110',
'0000000001101', '000000001100', '0000000001011', '0000000001010', '0000000001001', '0000000001100',
'0000000000111', '00000000001011', '0000000000110', '0000000001000', '00000000001001', '00000000001000',
'00000000001010', '0000000000001', '00000000000111', '00000000000110', '00000000000101', '00000000000100'],
# [4,8)
['1111', '001111', '1110', '001011', '01111', '1101', '001000', '01100', '01110', '1100', '0001111', '01010',
'01011', '1011', '0001011', '01000', '01001', '1010', '0001001', '001110', '001101', '1001', '0001000',
'001010', '001001', '1000', '00001111', '0001110', '0001101', '01101', '00001011', '00001110', '0001010',
'001100', '000001111', '00001010', '00001101', '0001100', '000001011', '000001110', '00001001', '00001100',
'000001000', '000001010', '000001101', '00001000', '0000001101', '000000111', '000001001', '000001100',
'0000001001', '0000001100', '0000001011', '0000001010', '0000000101', '0000001000', '0000000111', '0000000110',
'0000000001', '0000000100', '0000000011', '0000000010'],
# [8,)
['000011', '000000', '000001', '000100', '000101', '000110', '001000', '001001', '001010', '001011', '001100',
'001101', '001110', '001111', '010000', '010001', '010010', '010011', '010100', '010101', '010110', '010111',
'011000', '011001', '011010', '011011', '011100', '011101', '011110', '011111', '100000', '100001', '100010',
'100011', '100100', '100101', '100110', '100111', '101000', '101001', '101010', '101011', '101100', '101101',
'101110', '101111', '110000', '110001', '110010', '110011', '110100', '110101', '110110', '110111', '111000',
'111001', '111010', '111011', '111100', '111101', '111110', '111111'],
# -1
["01", "000111", "1", "000100", "000110", "001", "000011", "0000011", "0000010", "000101", "000010", "00000011",
"00000010", "0000000"],
# -2
["1", "0001111", "01", "0001110", "0001101", "001", "000000111", "0001100", "0001011", "00001", "000000110",
"000000101", "0001010", "000001", "0000000111", "0000000110", "000000100", "0001001", "00000000111",
"00000000110", "0000000101", "0001000", "000000000111", "000000000110", "00000000101", "0000000100",
"0000000000111", "000000000101", "000000000100", "00000000100"]
]
table9_9_a = [["1", "01", "001", "000"],
["1", "01", "00"],
["1", "0"]]
table9_9_b = [["0","1","000","000","110","00","00","0"],
["1","010","01","001","00","01","01","1"],
["2","011","001","01","01","10","1"],
["3","0010","100","10","10","11"],
["4","0011","101","110","111"],
["5","0001","110","111"],
["6","0000" "1","111"],
["7","0000" "0"]]
# table9_78 = [{},{},{},{},{},
# {},{},
# ["000001","0001","00001",],
# ['000001','0001','00001','011','11','10' '010' '001' '000000'
# {},{},
# {"0000":0,"0001":1,"001":2,"010":3,"1":4,"011":5}, #10
# {},{},{},{}]
table9_78 = [
["1", "011", "010", "0011", "0010", "00011", "00010", "000011", "000010", "0000011", "0000010", "00000011", "00000010", "000000011", "000000010", "000000001"],
["111","110", "101", "100", "011", "0101", "0100", "0011", "0010", "00011", "00010", "000011", "000010", "000001", "000000"],
["0101", "111", "110", "101", "0100", "0011", "100", "011", "0010", "00011", "00010", "000001", "00001", "000000"],
["00011", "111", "0101", "0100", "110", "101", "100", "0011", "011", "0010", "00010", "00001", "00000"],
["0101", "0100", "0011", "111", "110", "101", "100", "011", "0010", "00001", "0001", "00000"],
["000001", "00001", "111", "110", "101", "100", "011", "010", "0001", "001", "000000"],
["000001", "00001", "101", "100", "011", "11", "010", "0001", "001", "000000"],
["000001", "0001", "00001", "011", "11", "10", "010", "001", "000000"],
["000001", "000000", "0001", "11", "10", "001", "01", "00001"],
["00001", "00000", "001", "11", "10", "01", "0001"],
["0000", "0001", "001", "010", "1", "011"],
["0000", "0001", "01", "1", "001"],
["000", "001", "1", "01"],
["00", "01", "1"],
["0", "1"]]
# table9_10 = [{},
# {"1" :0, "01":1, "00":2},
# {"11":0, "10":1, "01":2, "00":3},
# {},{},{},{}]
table9_10 = [['1','0'],
['1','01','00'],
['11','10','01','00'],
['11','10','01','001','000'],
['11','10','011','010','001','000'],
['11','000','001','011','010','101','100'],
['111','110','101','100','011','010','001','0001','00001','000001','0000001','00000001','000000001','0000000001','00000000001']]
def __init__(self, bits, debug=False):
self.bits = bits if debug else bits[24:]
def u(self,n):
return self.bits.read(n).uint
def f(self,n):
return self.u(n)
def exp_golomb(self):
zeros = 0
while self.bits.read(1).uint == 0:
zeros += 1
return 0 if zeros == 0 else 2**zeros - 1 + self.bits.read(zeros).uint
def ue(self):
return self.exp_golomb()
def se(self):
from math import ceil
k = self.exp_golomb()
return (-1)**(k+1) * ceil(k/2)
def me(self, mb_pred_mode, chroma_array_type):
mb_pred_mode = mb_pred_mode if 'Intra' in mb_pred_mode else 'Inter'
if chroma_array_type in [1, 2]:
if mb_pred_mode in ['Intra_8x8', 'Intra_4x4']:
table = H264Bits.table9_4a_intra
elif mb_pred_mode == "Inter":
table = H264Bits.table9_4a_inter
else:
if mb_pred_mode in ['Intra_8x8', 'Intra_4x4']:
table = H264Bits.table9_4b_intra
elif mb_pred_mode == "Inter":
table = H264Bits.table9_4b_inter
return table[self.exp_golomb()]
def te(self, maximum):
if maximum > 1:
return self.ue()
else:
b = self.u(1)
return 0 if b == 1 else 1
def ce(self):
print("ce() not IMPL yet")
self.debug()
assert False
def find_code(self, table):
if table == {}:
assert False
right = self.bits.pos + 1
left = self.bits.pos
while not self.bits[left:right].bin in table:
right += 1
token = self.bits[left:right].bin
self.bits.pos = right
return (token, table.index(token))
def ce_coeff_token(self, nC):
# print(" decoding coeff token with nC ", nC)
# self.debug()
if 0 <= nC and nC < 2:
table = H264Bits.T1s_TC_coeff_token[0]
elif 2 <= nC and nC < 4:
table = H264Bits.T1s_TC_coeff_token[1]
elif 4 <= nC and nC < 8:
table = H264Bits.T1s_TC_coeff_token[2]
elif nC >= 8:
table = H264Bits.T1s_TC_coeff_token[3]
elif nC == -1:
table = H264Bits.T1s_TC_coeff_token[4]
elif nC == -2:
table = H264Bits.T1s_TC_coeff_token[5]
else:
raise NameError("Coeff table not found")
tb = [(0,0),(0,1),(1,1),(0,2),(1,2),(2,2)]
(token, idx) = self.find_code(table)
if idx < 6:
(t1s, tc) = tb[idx]
else:
(t1s, tc) = ((idx-6)%4, (idx-6)//4+3)
return (t1s, tc, token)
def ce_level_prefix(self):
zeros = 0
while self.bits.read(1).uint == 0:
zeros += 1
return zeros
def ce_total_zeros(self, tzVlcIndex, maxNumCoeff):
# print(" decoding total zeros with tzVlcIndex, maxNumCoeff:", tzVlcIndex, maxNumCoeff)
if maxNumCoeff == 4:
table = H264Bits.table9_9_a[tzVlcIndex - 1]
elif maxNumCoeff == 8:
table = H264Bits.table9_9_b[tzVlcIndex - 1]
else:
# print(" using table 9-7/8")
table = H264Bits.table9_78[tzVlcIndex - 1]
(token, value) = self.find_code(table)
# print(" find token, value:", token, value)
return value
def ce_run_before(self, zerosLeft):
if zerosLeft <= 6:
table = H264Bits.table9_10[zerosLeft - 1]
else:
table = H264Bits.table9_10[6]
# print("run_before: zerosLeft", zerosLeft)
(token, value) = self.find_code(table)
return value
def ae(self):
print("ae() not IMPL yet")
assert False
def next_bits(self, n):
return self.bits.peek(n).uint
def more_data(self):
return self.bits.pos < self.bits.length
def byte_aligned(self):
return self.bits.pos % 8 == 0
def more_rbsp_data(self):
if not self.more_data():
return False
i = self.bits.length - 1
while i >= 0:
if self.bits[i] == True:
if self.bits.pos == i:
return False
else:
return True
i -= 1
def debug(self):
print(self.bits[self.bits.pos:self.bits.pos+64].bin)
if __name__ == "__main__":
from bitstring import BitStream
raw = BitStream('0b110010000100')
bs = H264Bits(raw, debug=True)
print(bs.next_bits(2))
print(bs.u(1))
print(bs.f(1))
print(bs.ue())
print(bs.se())